For clarification, I'm talking full-frame with the black box film base surrounding the image .. as opposed to a cropping/non-cropping discussion.
I used to always print my 35mm full frame. Then I stopped for awhile. Now that I have a glass 4x5 neg carrier, I can print even my MF negs full frame. Haven't really gotten back into it yet, mostly due to my current darkroom setup being fairly new to me and I'm just now settling into a routine.
For me, full-frame began as "proof of total negative" - that philosophy that composition, whether deliberate or accidental, should occur in the camera. Even though I still don't crop my negs (only enlarge certain parts of a neg) - I'm also not so dedicated to that philosophy anymore. However, I still like the aesthetics of the black-box when viewing others work.
These days I find it more appealing in smaller work, rather than huge prints.